sh: dma: Make G2 DMA configurable.
[linux-2.6.git] / sound / sh / aica.c
1 /*
2 * This code is licenced under 
3 * the General Public Licence
4 * version 2
5 *
6 * Copyright Adrian McMenamin 2005, 2006, 2007
7 * <adrian@mcmen.demon.co.uk>
8 * Requires firmware (BSD licenced) available from:
9 * http://linuxdc.cvs.sourceforge.net/linuxdc/linux-sh-dc/sound/oss/aica/firmware/
10 * or the maintainer
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of version 2 of the GNU General Public License as published by
14 * the Free Software Foundation.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
24 *
25 */
26
27 #include <linux/init.h>
28 #include <linux/jiffies.h>
29 #include <linux/slab.h>
30 #include <linux/time.h>
31 #include <linux/wait.h>
32 #include <linux/moduleparam.h>
33 #include <linux/platform_device.h>
34 #include <linux/firmware.h>
35 #include <linux/timer.h>
36 #include <linux/delay.h>
37 #include <linux/workqueue.h>
38 #include <sound/core.h>
39 #include <sound/control.h>
40 #include <sound/pcm.h>
41 #include <sound/initval.h>
42 #include <sound/info.h>
43 #include <asm/io.h>
44 #include <asm/dma.h>
45 #include <mach/sysasic.h>
46 #include "aica.h"
47
48 MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
49 MODULE_DESCRIPTION("Dreamcast AICA sound (pcm) driver");
50 MODULE_LICENSE("GPL");
51 MODULE_SUPPORTED_DEVICE("{{Yamaha/SEGA, AICA}}");
52
53 /* module parameters */
54 #define CARD_NAME "AICA"
55 static int index = -1;
56 static char *id;
57 static int enable = 1;
58 module_param(index, int, 0444);
59 MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
60 module_param(id, charp, 0444);
61 MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
62 module_param(enable, bool, 0644);
63 MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");
64
65 /* Use workqueue */
66 static struct workqueue_struct *aica_queue;
67
68 /* Simple platform device */
69 static struct platform_device *pd;
70 static struct resource aica_memory_space[2] = {
71         {
72          .name = "AICA ARM CONTROL",
73          .start = ARM_RESET_REGISTER,
74          .flags = IORESOURCE_MEM,
75          .end = ARM_RESET_REGISTER + 3,
76          },
77         {
78          .name = "AICA Sound RAM",
79          .start = SPU_MEMORY_BASE,
80          .flags = IORESOURCE_MEM,
81          .end = SPU_MEMORY_BASE + 0x200000 - 1,
82          },
83 };
84
85 /* SPU specific functions */
86 /* spu_write_wait - wait for G2-SH FIFO to clear */
87 static void spu_write_wait(void)
88 {
89         int time_count;
90         time_count = 0;
91         while (1) {
92                 if (!(readl(G2_FIFO) & 0x11))
93                         break;
94                 /* To ensure hardware failure doesn't wedge kernel */
95                 time_count++;
96                 if (time_count > 0x10000) {
97                         snd_printk
98                             ("WARNING: G2 FIFO appears to be blocked.\n");
99                         break;
100                 }
101         }
102 }
103
104 /* spu_memset - write to memory in SPU address space */
105 static void spu_memset(u32 toi, u32 what, int length)
106 {
107         int i;
108         unsigned long flags;
109         if (snd_BUG_ON(length % 4))
110                 return;
111         for (i = 0; i < length; i++) {
112                 if (!(i % 8))
113                         spu_write_wait();
114                 local_irq_save(flags);
115                 writel(what, toi + SPU_MEMORY_BASE);
116                 local_irq_restore(flags);
117                 toi++;
118         }
119 }
120
121 /* spu_memload - write to SPU address space */
122 static void spu_memload(u32 toi, void *from, int length)
123 {
124         unsigned long flags;
125         u32 *froml = from;
126         u32 __iomem *to = (u32 __iomem *) (SPU_MEMORY_BASE + toi);
127         int i;
128         u32 val;
129         length = DIV_ROUND_UP(length, 4);
130         spu_write_wait();
131         for (i = 0; i < length; i++) {
132                 if (!(i % 8))
133                         spu_write_wait();
134                 val = *froml;
135                 local_irq_save(flags);
136                 writel(val, to);
137                 local_irq_restore(flags);
138                 froml++;
139                 to++;
140         }
141 }
142
143 /* spu_disable - set spu registers to stop sound output */
144 static void spu_disable(void)
145 {
146         int i;
147         unsigned long flags;
148         u32 regval;
149         spu_write_wait();
150         regval = readl(ARM_RESET_REGISTER);
151         regval |= 1;
152         spu_write_wait();
153         local_irq_save(flags);
154         writel(regval, ARM_RESET_REGISTER);
155         local_irq_restore(flags);
156         for (i = 0; i < 64; i++) {
157                 spu_write_wait();
158                 regval = readl(SPU_REGISTER_BASE + (i * 0x80));
159                 regval = (regval & ~0x4000) | 0x8000;
160                 spu_write_wait();
161                 local_irq_save(flags);
162                 writel(regval, SPU_REGISTER_BASE + (i * 0x80));
163                 local_irq_restore(flags);
164         }
165 }
166
167 /* spu_enable - set spu registers to enable sound output */
168 static void spu_enable(void)
169 {
170         unsigned long flags;
171         u32 regval = readl(ARM_RESET_REGISTER);
172         regval &= ~1;
173         spu_write_wait();
174         local_irq_save(flags);
175         writel(regval, ARM_RESET_REGISTER);
176         local_irq_restore(flags);
177 }
178
179 /* 
180  * Halt the sound processor, clear the memory,
181  * load some default ARM7 code, and then restart ARM7
182 */
183 static void spu_reset(void)
184 {
185         unsigned long flags;
186         spu_disable();
187         spu_memset(0, 0, 0x200000 / 4);
188         /* Put ARM7 in endless loop */
189         local_irq_save(flags);
190         ctrl_outl(0xea000002, SPU_MEMORY_BASE);
191         local_irq_restore(flags);
192         spu_enable();
193 }
194
195 /* aica_chn_start - write to spu to start playback */
196 static void aica_chn_start(void)
197 {
198         unsigned long flags;
199         spu_write_wait();
200         local_irq_save(flags);
201         writel(AICA_CMD_KICK | AICA_CMD_START, (u32 *) AICA_CONTROL_POINT);
202         local_irq_restore(flags);
203 }
204
205 /* aica_chn_halt - write to spu to halt playback */
206 static void aica_chn_halt(void)
207 {
208         unsigned long flags;
209         spu_write_wait();
210         local_irq_save(flags);
211         writel(AICA_CMD_KICK | AICA_CMD_STOP, (u32 *) AICA_CONTROL_POINT);
212         local_irq_restore(flags);
213 }
214
215 /* ALSA code below */
216 static struct snd_pcm_hardware snd_pcm_aica_playback_hw = {
217         .info = (SNDRV_PCM_INFO_NONINTERLEAVED),
218         .formats =
219             (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE |
220              SNDRV_PCM_FMTBIT_IMA_ADPCM),
221         .rates = SNDRV_PCM_RATE_8000_48000,
222         .rate_min = 8000,
223         .rate_max = 48000,
224         .channels_min = 1,
225         .channels_max = 2,
226         .buffer_bytes_max = AICA_BUFFER_SIZE,
227         .period_bytes_min = AICA_PERIOD_SIZE,
228         .period_bytes_max = AICA_PERIOD_SIZE,
229         .periods_min = AICA_PERIOD_NUMBER,
230         .periods_max = AICA_PERIOD_NUMBER,
231 };
232
233 static int aica_dma_transfer(int channels, int buffer_size,
234                              struct snd_pcm_substream *substream)
235 {
236         int q, err, period_offset;
237         struct snd_card_aica *dreamcastcard;
238         struct snd_pcm_runtime *runtime;
239         unsigned long flags;
240         err = 0;
241         dreamcastcard = substream->pcm->private_data;
242         period_offset = dreamcastcard->clicks;
243         period_offset %= (AICA_PERIOD_NUMBER / channels);
244         runtime = substream->runtime;
245         for (q = 0; q < channels; q++) {
246                 local_irq_save(flags);
247                 err = dma_xfer(AICA_DMA_CHANNEL,
248                                (unsigned long) (runtime->dma_area +
249                                                 (AICA_BUFFER_SIZE * q) /
250                                                 channels +
251                                                 AICA_PERIOD_SIZE *
252                                                 period_offset),
253                                AICA_CHANNEL0_OFFSET + q * CHANNEL_OFFSET +
254                                AICA_PERIOD_SIZE * period_offset,
255                                buffer_size / channels, AICA_DMA_MODE);
256                 if (unlikely(err < 0)) {
257                         local_irq_restore(flags);
258                         break;
259                 }
260                 dma_wait_for_completion(AICA_DMA_CHANNEL);
261                 local_irq_restore(flags);
262         }
263         return err;
264 }
265
266 static void startup_aica(struct snd_card_aica *dreamcastcard)
267 {
268         spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
269                     dreamcastcard->channel, sizeof(struct aica_channel));
270         aica_chn_start();
271 }
272
273 static void run_spu_dma(struct work_struct *work)
274 {
275         int buffer_size;
276         struct snd_pcm_runtime *runtime;
277         struct snd_card_aica *dreamcastcard;
278         dreamcastcard =
279             container_of(work, struct snd_card_aica, spu_dma_work);
280         runtime = dreamcastcard->substream->runtime;
281         if (unlikely(dreamcastcard->dma_check == 0)) {
282                 buffer_size =
283                     frames_to_bytes(runtime, runtime->buffer_size);
284                 if (runtime->channels > 1)
285                         dreamcastcard->channel->flags |= 0x01;
286                 aica_dma_transfer(runtime->channels, buffer_size,
287                                   dreamcastcard->substream);
288                 startup_aica(dreamcastcard);
289                 dreamcastcard->clicks =
290                     buffer_size / (AICA_PERIOD_SIZE * runtime->channels);
291                 return;
292         } else {
293                 aica_dma_transfer(runtime->channels,
294                                   AICA_PERIOD_SIZE * runtime->channels,
295                                   dreamcastcard->substream);
296                 snd_pcm_period_elapsed(dreamcastcard->substream);
297                 dreamcastcard->clicks++;
298                 if (unlikely(dreamcastcard->clicks >= AICA_PERIOD_NUMBER))
299                         dreamcastcard->clicks %= AICA_PERIOD_NUMBER;
300                 mod_timer(&dreamcastcard->timer, jiffies + 1);
301         }
302 }
303
304 static void aica_period_elapsed(unsigned long timer_var)
305 {
306         /*timer function - so cannot sleep */
307         int play_period;
308         struct snd_pcm_runtime *runtime;
309         struct snd_pcm_substream *substream;
310         struct snd_card_aica *dreamcastcard;
311         substream = (struct snd_pcm_substream *) timer_var;
312         runtime = substream->runtime;
313         dreamcastcard = substream->pcm->private_data;
314         /* Have we played out an additional period? */
315         play_period =
316             frames_to_bytes(runtime,
317                             readl
318                             (AICA_CONTROL_CHANNEL_SAMPLE_NUMBER)) /
319             AICA_PERIOD_SIZE;
320         if (play_period == dreamcastcard->current_period) {
321                 /* reschedule the timer */
322                 mod_timer(&(dreamcastcard->timer), jiffies + 1);
323                 return;
324         }
325         if (runtime->channels > 1)
326                 dreamcastcard->current_period = play_period;
327         if (unlikely(dreamcastcard->dma_check == 0))
328                 dreamcastcard->dma_check = 1;
329         queue_work(aica_queue, &(dreamcastcard->spu_dma_work));
330 }
331
332 static void spu_begin_dma(struct snd_pcm_substream *substream)
333 {
334         struct snd_card_aica *dreamcastcard;
335         struct snd_pcm_runtime *runtime;
336         runtime = substream->runtime;
337         dreamcastcard = substream->pcm->private_data;
338         /*get the queue to do the work */
339         queue_work(aica_queue, &(dreamcastcard->spu_dma_work));
340         /* Timer may already be running */
341         if (unlikely(dreamcastcard->timer.data)) {
342                 mod_timer(&dreamcastcard->timer, jiffies + 4);
343                 return;
344         }
345         init_timer(&(dreamcastcard->timer));
346         dreamcastcard->timer.data = (unsigned long) substream;
347         dreamcastcard->timer.function = aica_period_elapsed;
348         dreamcastcard->timer.expires = jiffies + 4;
349         add_timer(&(dreamcastcard->timer));
350 }
351
352 static int snd_aicapcm_pcm_open(struct snd_pcm_substream
353                                 *substream)
354 {
355         struct snd_pcm_runtime *runtime;
356         struct aica_channel *channel;
357         struct snd_card_aica *dreamcastcard;
358         if (!enable)
359                 return -ENOENT;
360         dreamcastcard = substream->pcm->private_data;
361         channel = kmalloc(sizeof(struct aica_channel), GFP_KERNEL);
362         if (!channel)
363                 return -ENOMEM;
364         /* set defaults for channel */
365         channel->sfmt = SM_8BIT;
366         channel->cmd = AICA_CMD_START;
367         channel->vol = dreamcastcard->master_volume;
368         channel->pan = 0x80;
369         channel->pos = 0;
370         channel->flags = 0;     /* default to mono */
371         dreamcastcard->channel = channel;
372         runtime = substream->runtime;
373         runtime->hw = snd_pcm_aica_playback_hw;
374         spu_enable();
375         dreamcastcard->clicks = 0;
376         dreamcastcard->current_period = 0;
377         dreamcastcard->dma_check = 0;
378         return 0;
379 }
380
381 static int snd_aicapcm_pcm_close(struct snd_pcm_substream
382                                  *substream)
383 {
384         struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
385         flush_workqueue(aica_queue);
386         if (dreamcastcard->timer.data)
387                 del_timer(&dreamcastcard->timer);
388         kfree(dreamcastcard->channel);
389         spu_disable();
390         return 0;
391 }
392
393 static int snd_aicapcm_pcm_hw_free(struct snd_pcm_substream
394                                    *substream)
395 {
396         /* Free the DMA buffer */
397         return snd_pcm_lib_free_pages(substream);
398 }
399
400 static int snd_aicapcm_pcm_hw_params(struct snd_pcm_substream
401                                      *substream, struct snd_pcm_hw_params
402                                      *hw_params)
403 {
404         /* Allocate a DMA buffer using ALSA built-ins */
405         return
406             snd_pcm_lib_malloc_pages(substream,
407                                      params_buffer_bytes(hw_params));
408 }
409
410 static int snd_aicapcm_pcm_prepare(struct snd_pcm_substream
411                                    *substream)
412 {
413         struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
414         if ((substream->runtime)->format == SNDRV_PCM_FORMAT_S16_LE)
415                 dreamcastcard->channel->sfmt = SM_16BIT;
416         dreamcastcard->channel->freq = substream->runtime->rate;
417         dreamcastcard->substream = substream;
418         return 0;
419 }
420
421 static int snd_aicapcm_pcm_trigger(struct snd_pcm_substream
422                                    *substream, int cmd)
423 {
424         switch (cmd) {
425         case SNDRV_PCM_TRIGGER_START:
426                 spu_begin_dma(substream);
427                 break;
428         case SNDRV_PCM_TRIGGER_STOP:
429                 aica_chn_halt();
430                 break;
431         default:
432                 return -EINVAL;
433         }
434         return 0;
435 }
436
437 static unsigned long snd_aicapcm_pcm_pointer(struct snd_pcm_substream
438                                              *substream)
439 {
440         return readl(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER);
441 }
442
443 static struct snd_pcm_ops snd_aicapcm_playback_ops = {
444         .open = snd_aicapcm_pcm_open,
445         .close = snd_aicapcm_pcm_close,
446         .ioctl = snd_pcm_lib_ioctl,
447         .hw_params = snd_aicapcm_pcm_hw_params,
448         .hw_free = snd_aicapcm_pcm_hw_free,
449         .prepare = snd_aicapcm_pcm_prepare,
450         .trigger = snd_aicapcm_pcm_trigger,
451         .pointer = snd_aicapcm_pcm_pointer,
452 };
453
454 /* TO DO: set up to handle more than one pcm instance */
455 static int __init snd_aicapcmchip(struct snd_card_aica
456                                   *dreamcastcard, int pcm_index)
457 {
458         struct snd_pcm *pcm;
459         int err;
460         /* AICA has no capture ability */
461         err =
462             snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0,
463                         &pcm);
464         if (unlikely(err < 0))
465                 return err;
466         pcm->private_data = dreamcastcard;
467         strcpy(pcm->name, "AICA PCM");
468         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
469                         &snd_aicapcm_playback_ops);
470         /* Allocate the DMA buffers */
471         err =
472             snd_pcm_lib_preallocate_pages_for_all(pcm,
473                                                   SNDRV_DMA_TYPE_CONTINUOUS,
474                                                   snd_dma_continuous_data
475                                                   (GFP_KERNEL),
476                                                   AICA_BUFFER_SIZE,
477                                                   AICA_BUFFER_SIZE);
478         return err;
479 }
480
481 /* Mixer controls */
482 #define aica_pcmswitch_info             snd_ctl_boolean_mono_info
483
484 static int aica_pcmswitch_get(struct snd_kcontrol *kcontrol,
485                               struct snd_ctl_elem_value *ucontrol)
486 {
487         ucontrol->value.integer.value[0] = 1;   /* TO DO: Fix me */
488         return 0;
489 }
490
491 static int aica_pcmswitch_put(struct snd_kcontrol *kcontrol,
492                               struct snd_ctl_elem_value *ucontrol)
493 {
494         if (ucontrol->value.integer.value[0] == 1)
495                 return 0;       /* TO DO: Fix me */
496         else
497                 aica_chn_halt();
498         return 0;
499 }
500
501 static int aica_pcmvolume_info(struct snd_kcontrol *kcontrol,
502                                struct snd_ctl_elem_info *uinfo)
503 {
504         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
505         uinfo->count = 1;
506         uinfo->value.integer.min = 0;
507         uinfo->value.integer.max = 0xFF;
508         return 0;
509 }
510
511 static int aica_pcmvolume_get(struct snd_kcontrol *kcontrol,
512                               struct snd_ctl_elem_value *ucontrol)
513 {
514         struct snd_card_aica *dreamcastcard;
515         dreamcastcard = kcontrol->private_data;
516         if (unlikely(!dreamcastcard->channel))
517                 return -ETXTBSY;        /* we've not yet been set up */
518         ucontrol->value.integer.value[0] = dreamcastcard->channel->vol;
519         return 0;
520 }
521
522 static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol,
523                               struct snd_ctl_elem_value *ucontrol)
524 {
525         struct snd_card_aica *dreamcastcard;
526         unsigned int vol;
527         dreamcastcard = kcontrol->private_data;
528         if (unlikely(!dreamcastcard->channel))
529                 return -ETXTBSY;
530         vol = ucontrol->value.integer.value[0];
531         if (vol > 0xff)
532                 return -EINVAL;
533         if (unlikely(dreamcastcard->channel->vol == vol))
534                 return 0;
535         dreamcastcard->channel->vol = ucontrol->value.integer.value[0];
536         dreamcastcard->master_volume = ucontrol->value.integer.value[0];
537         spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
538                     dreamcastcard->channel, sizeof(struct aica_channel));
539         return 1;
540 }
541
542 static struct snd_kcontrol_new snd_aica_pcmswitch_control __devinitdata = {
543         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
544         .name = "PCM Playback Switch",
545         .index = 0,
546         .info = aica_pcmswitch_info,
547         .get = aica_pcmswitch_get,
548         .put = aica_pcmswitch_put
549 };
550
551 static struct snd_kcontrol_new snd_aica_pcmvolume_control __devinitdata = {
552         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
553         .name = "PCM Playback Volume",
554         .index = 0,
555         .info = aica_pcmvolume_info,
556         .get = aica_pcmvolume_get,
557         .put = aica_pcmvolume_put
558 };
559
560 static int load_aica_firmware(void)
561 {
562         int err;
563         const struct firmware *fw_entry;
564         spu_reset();
565         err = request_firmware(&fw_entry, "aica_firmware.bin", &pd->dev);
566         if (unlikely(err))
567                 return err;
568         /* write firware into memory */
569         spu_disable();
570         spu_memload(0, fw_entry->data, fw_entry->size);
571         spu_enable();
572         release_firmware(fw_entry);
573         return err;
574 }
575
576 static int __devinit add_aicamixer_controls(struct snd_card_aica
577                                             *dreamcastcard)
578 {
579         int err;
580         err = snd_ctl_add
581             (dreamcastcard->card,
582              snd_ctl_new1(&snd_aica_pcmvolume_control, dreamcastcard));
583         if (unlikely(err < 0))
584                 return err;
585         err = snd_ctl_add
586             (dreamcastcard->card,
587              snd_ctl_new1(&snd_aica_pcmswitch_control, dreamcastcard));
588         if (unlikely(err < 0))
589                 return err;
590         return 0;
591 }
592
593 static int __devexit snd_aica_remove(struct platform_device *devptr)
594 {
595         struct snd_card_aica *dreamcastcard;
596         dreamcastcard = platform_get_drvdata(devptr);
597         if (unlikely(!dreamcastcard))
598                 return -ENODEV;
599         snd_card_free(dreamcastcard->card);
600         kfree(dreamcastcard);
601         platform_set_drvdata(devptr, NULL);
602         return 0;
603 }
604
605 static int __devinit snd_aica_probe(struct platform_device *devptr)
606 {
607         int err;
608         struct snd_card_aica *dreamcastcard;
609         dreamcastcard = kmalloc(sizeof(struct snd_card_aica), GFP_KERNEL);
610         if (unlikely(!dreamcastcard))
611                 return -ENOMEM;
612         dreamcastcard->card =
613             snd_card_new(index, SND_AICA_DRIVER, THIS_MODULE, 0);
614         if (unlikely(!dreamcastcard->card)) {
615                 kfree(dreamcastcard);
616                 return -ENODEV;
617         }
618         strcpy(dreamcastcard->card->driver, "snd_aica");
619         strcpy(dreamcastcard->card->shortname, SND_AICA_DRIVER);
620         strcpy(dreamcastcard->card->longname,
621                "Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast");
622         /* Prepare to use the queue */
623         INIT_WORK(&(dreamcastcard->spu_dma_work), run_spu_dma);
624         /* Load the PCM 'chip' */
625         err = snd_aicapcmchip(dreamcastcard, 0);
626         if (unlikely(err < 0))
627                 goto freedreamcast;
628         snd_card_set_dev(dreamcastcard->card, &devptr->dev);
629         dreamcastcard->timer.data = 0;
630         dreamcastcard->channel = NULL;
631         /* Add basic controls */
632         err = add_aicamixer_controls(dreamcastcard);
633         if (unlikely(err < 0))
634                 goto freedreamcast;
635         /* Register the card with ALSA subsystem */
636         err = snd_card_register(dreamcastcard->card);
637         if (unlikely(err < 0))
638                 goto freedreamcast;
639         platform_set_drvdata(devptr, dreamcastcard);
640         aica_queue = create_workqueue(CARD_NAME);
641         if (unlikely(!aica_queue))
642                 goto freedreamcast;
643         snd_printk
644             ("ALSA Driver for Yamaha AICA Super Intelligent Sound Processor\n");
645         return 0;
646       freedreamcast:
647         snd_card_free(dreamcastcard->card);
648         kfree(dreamcastcard);
649         return err;
650 }
651
652 static struct platform_driver snd_aica_driver = {
653         .probe = snd_aica_probe,
654         .remove = __devexit_p(snd_aica_remove),
655         .driver = {
656                    .name = SND_AICA_DRIVER},
657 };
658
659 static int __init aica_init(void)
660 {
661         int err;
662         err = platform_driver_register(&snd_aica_driver);
663         if (unlikely(err < 0))
664                 return err;
665         pd = platform_device_register_simple(SND_AICA_DRIVER, -1,
666                                              aica_memory_space, 2);
667         if (IS_ERR(pd)) {
668                 platform_driver_unregister(&snd_aica_driver);
669                 return PTR_ERR(pd);
670         }
671         /* Load the firmware */
672         return load_aica_firmware();
673 }
674
675 static void __exit aica_exit(void)
676 {
677         /* Destroy the aica kernel thread            *
678          * being extra cautious to check if it exists*/
679         if (likely(aica_queue))
680                 destroy_workqueue(aica_queue);
681         platform_device_unregister(pd);
682         platform_driver_unregister(&snd_aica_driver);
683         /* Kill any sound still playing and reset ARM7 to safe state */
684         spu_reset();
685 }
686
687 module_init(aica_init);
688 module_exit(aica_exit);